Business is booming at the Amazon fulfillment center in Robbinsville, Mercer County, where over 4,000 employees in a warehouse the size of 28 football fields are picking, packing and shipping hundreds of thousands of items.

"It's been crazy here, but everybody's pretty much laid back and keeping the pace up," Amazon picker Amanda Miller said.

There's a roar inside the warehouse. It's the sound of 12 miles of conveyor belts moving packages from storage to shipping to your front door.

"On Cyber Monday last year customers ordered 54 million items. That is 629 items per second and this year we know we will beat those numbers," Amazon spokeswoman Julie Law said.

"I love the aspect of I don't have to use my gas or my car. I can just go right online and order something," Jordan Glover of Trenton said.

Nationwide Amazon is hiring 120,000 seasonal employees and at the rate people are buying online this Cyber Monday, they'll need the help.